Roller skate



FIG. 1 is a perspective view of a roller skate showing my new design, the side opposite being a mirror image;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a roller skate, as shown and described. 